Early game · first 8 minutes
Throw Call Bell at Rat King’s feet and shoot it to detonate it. Fight from beside cover while his weapon accuracy is reduced, keeping a dash for any rats that attach.
The Doorman vs Rat King
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Mid game · Walkers
Use the alternate cast of Luggage Cart to move an injured teammate away from Rat King and toward cover.
Late game · Patron
Use Hotel Guest on Rat King while Royal Pestments is active, then attack his teammates while he is gone. Throw Call Bell at the spot where he returns.